add linting gh action

.github/workflows/release.yml

@@ -39,3 +39,39 @@ jobs:
       - name: Build dist
         run: yarn build
         if: steps.dist.outputs.cache-hit != 'true'
+  lint:
+    runs-on: ubuntu-latest
+    env:
+      GH_PR_NUM: ${{ github.event.number }}
+    needs: build
+    steps:
+      - uses: actions/checkout@v2
+      - run: |
+          if [[ ! -z "${GH_PR_NUM}" ]]; then 
+            echo "Checking out PR"
+            git fetch origin pull/$GH_PR_NUM/head:tmp
+            git checkout tmp
+          fi
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '14'
+      - uses: actions/cache@v2
+        id: yarn-cache
+        name: Cache npm deps
+        with:
+          path: |
+           node_modules
+           **/node_modules
+          key: ${{ runner.os }}-yarn-14-${{ secrets.CACHE_VERSION }}-${{ hashFiles('yarn.lock') }}
+      - run: yarn install --frozen-lockfile
+        if: steps.yarn-cache.outputs.cache-hit != 'true'
+      - uses: actions/cache@v2
+        id: lint-cache
+        name: Load lint cache
+        with:
+          path: '.eslintcache'
+          key: ${{ runner.os }}-lint-14-${{ secrets.CACHE_VERSION }}-${{ hashFiles('yarn.lock') }}
+      - name: ESLint
+        run: yarn lint:js
+      - name: MDLint
+        run: yarn lint:md